In the lesson a thermos is presented as an example of an isolated energy system. How could you change the thermos into an open energy system?
Answer:
The lid of the thermos must be removed.
Explanation:
The definition of an open system is one that can exchange heat and mass with the surrounding medium. A closed thermos cannot exchange mass or temperature with the medium. By removing the lid, it has the possibility of exchanging mass and energy in the form of heat with the medium in which it is found.
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A certain force gives a 5-kg object an acceleration of 2.0 m/s2. the same force would give a 20-kg object an acceleration of
Which statement describes how echolocation and ultrasound imaging are the same?
A.They both use the absorption of sound waves.
B.They both use the diffraction of sound waves.
C.They both use the reflection of sound waves.
D.They both use the transmission of sound waves.
Answer: The correct option is C.
Explanation:
The sound wave is reflected back after striking from the barrier. This is called the reflection of the sound.
When the sound wave incidents on the barrier then it is called incident wave.
When the sound wave gets reflected back from the barrier then it is called reflected wave.
Ultrasound imaging is a medical technique which is used to take the image of the internal parts of organ of the body.
Echolocation is the process which is used by several species. It is used by bats to locate its prey. It is the biological SONAR.
Therefore, echolocation and ultrasound imaging are same as they both use the reflection of sound waves.
The energy source used to produce most of the electrical energy in the United States is _______? Can someone help me on this?,
"which forms of light are lower in energy and frequency than the light that our eyes can see"
Infrared light, microwave radiation, and radio waves are all forms of light that have lower energy and frequency than what our eyes can perceive. These forms of light are part of the electromagnetic spectrum and have various applications in technology.
Explanation:The forms of light that are lower in energy and frequency than the light that our human eyes can see are infrared light, microwave radiation, and radio waves. These forms of light make up part of the electromagnetic spectrum, which ranges from high-frequency, high-energy gamma rays to low-frequency, low-energy radio waves.
In relation to the visible light we see, these energies are less, and therefore their frequencies are also lower. To illustrate, infrared light is just below red light on the spectrum and is often associated with heat radiation. Microwave radiation is commonly used in technologies such as microwave ovens and wireless communication devices, and radio waves are the longest and hence the lowest energy/frequency waves in the spectrum, utilized in broadcasting signals such as television and radio.
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With what minimum speed must you toss a 200 g ball straight up to just touch the 15-m-high roof of the gymnasium if you release the ball 1.6 m above the ground? solve this problem using energy.
The transfer of energy as heat caused by the collision of molecules is called _________. radiation convection conduction contact
A ball is thrown upward from the ground with an initial speed speed of 25 meters/second; at the same instant, a ball is dropped from rest from a building 15 meters high. After how long will the balls be at the same height?
What effect does the removal of vegetation have on soil ?
Which statement is true?Select one of the options below as your answer: A. Gas atoms subjected to electricity emit bright lines. B. Gas atoms absorb white light and emit a continuous spectrum of light. C. Gas atoms under high pressure emit dark lines against a continuous spectrum. D. Gas atoms heated to a high temperature emit white light. E. Gas atoms subjected to electricity do not emit a spectrum,
Question 2 Saved
What might you look for as evidence that fusion occurs inside a star?
Question 2 options:
antiprotons
protons
electrons
neutinos
The atomic model that describes an atom as a spherical object containing a certain number of electrons trapped in a mass of positive charge is often called ____ model.
This atomic model was developed in 1904 by the British scientist J.J. Thomson, from his discovery of the existence of the electron in 1897.
Taking into consideration that at that time there was still no evidence of the atom nucleus, Thomson thought the electrons (with negative charge) were immersed in a substance (the atom) of positive charge that counteracted the negative charge of the electrons. Just like the raisins embedded in a pudding or bread.
That is why this model was called the raisin pudding atomic model
you can feel the heat waves from small electric heater on your hands and face even though the heater is on the other side of the room this is an example of
Final answer:
Feeling the heat from a heater at a distance is an example of heat transfer by radiation, where electromagnetic waves emitted by the heater are absorbed by the skin, causing a warming sensation.
Explanation:
Feeling the heat waves from a small electric heater on your hands and face, even though the heater is on the other side of the room, is an example of heat transfer by radiation. This occurs when a hot body like a heater emits electromagnetic waves that travel through the space and are absorbed by your skin, warming you without the need for a medium. This type of heat transfer is the same that occurs when we feel the warmth from the Sun or when an oven warms us as we walk by.
An atom that has a negative four charge will have which of the following?Answer 4 more protons than electrons An equal amount of protons and electrons 4 more electrons than protons 2 more neutrons than protons,
An atom with a negative four charge will have 4 more electrons than protons.
An atom that has a negative four charge will have 4 more electrons than protons. This is because the charge of an atom is determined by the difference between the number of protons and electrons. A neutral atom has an equal number of protons and electrons, leading to no net charge. If there are more electrons than protons, the excess negative charges from the electrons result in a negative charge for the atom.
In the case of an atom with a negative four charge, also known as an anion, the atomic charge can be calculated as number of protons - number of electrons. Since each electron has a negative charge equal to the positive charge of a proton, the atom in question with a -4 charge must have four more electrons than protons.
What is the average acceleration during the time interval 0 seconds to 10 seconds?
a) 0.5 meters/seconds^2
b) 1 meter/second^2
c) 2meters/second^2
d) 3 meters/second^2,
Please help me answer these questions ASAP !
A box of mass 3.0 kg is accelerated from rest across a floor at a rate of 3.0 m/s2 for 4.0 s . what is the net work
Water vapor is an example of what phase? A. Plasma B. Gas C. Solid D. Liquid
What material is rare in the atmosphere of earth, but common in the atmospheres of mars and venus?
When light is scattered while spreading out through the atmosphere, the light rays
Final answer:
Light scattering caused by the Earth's atmosphere results in the 'twinkling' of stars, polarization of light, and the blue color of the sky. The scattering leads to a blur and changing nature of the blur due to atmospheric conditions. Scattered blue light colors the sky and makes the Sun appear yellower.
Explanation:
When light rays spread out through the Earth's atmosphere, they undergo a process known as scattering. This can be compared to the way confetti is dispersed by the wind. As light from the stars enters our atmosphere, various air currents and atmospheric conditions alter their paths leading to a blurred image when viewed from Earth; this effect is often observed as the twinkling of stars. Interestingly, polarization by scattering also occurs, and the light from the sky can appear brighter or dimmer when viewed through polarized lenses like sunglasses due to this scattering effect.
The blue color of the sky is also a result of scattering. Molecules in the atmosphere scatter shorter wavelengths of light (blue) more than longer wavelengths (red). This preferential scattering causes the sky to appear blue and the sun to seem somewhat yellower than it would in space. Furthermore, the intensity of light diminishes as it travels farther from its source. The light from the sun travels such long distances that by the time it reaches Earth, its rays are essentially parallel, causing consistent scattering across the globe.
an object which has a mass of 70 kg is sitting on a cliff 10m high calculate the objects potential energy. given g=10m/s^2
A.7,000 Joules
B. 3,500 Joules
C. 700 Joules
D. 70 Joules
E. 35 Joules
Answer: Potential Energy = 7,000 Joules(A)
Explanation:
Potential Energy is the energy possessed by the virtue of its position and it is given as,
P. E = mgh
Where m is the mass= 70kg
g is acceleration due to gravity =10m/s²
h= height = 10m
P. E = 70×10×10
P. E= 7000J
Therefore the potential energy is 7000J
The force in Newtons on a particle directed along the x-axis is given by F(x)=exp(−(x/2)+6) for x≥0 where x is in meters. The particle is constrained to move along the x-axis. Find the work done in Joules on the particle, W, in moving it from x=0 to x=1 using the fact that F=dW/dx. For your reference, 1 Joule = 1 Newton × 1 meter.,
The work done on the particle as it moves from x = 0 to x = 1 meter under the force F(x) = exp(-x/2 + 6) is obtained by integrating the force function over the distance, resulting in a measurable amount of work in Joules.
Explanation:The work done W on a particle as it moves from initial position xi to final position xf under a force F(x) is calculated by integrating the force over the distance. Considering the given force function F(x) = exp(-x/2 + 6), the work done from x = 0 to x = 1 meter is:
W = ∫ F(x) dx
= ∫ exp(-x/2 + 6) dx from x = 0 to x = 1
= ∫ e(-x/2 + 6) dx from x = 0 to x = 1
= -2e(-x/2 + 6) | from x = 0 to x = 1
= -2(e(-1/2 + 6) - e6)
= -2(e(11/2) - e6) Joules
By calculating the definite integral, we can find the total amount of work done in Joules on the particle during this displacement.
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An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?
A. 0.9 m/s
B. 110 m/s²
C. 110 m/s
D. 1.1 m/s²
@Vonte12,
Suppose you are holding a flat mirror and standing at the center of a giant clock face built into the floor. someone standing at 12 o'clock shines a beam of light toward you, and you want to use the mirror to reflect the beam toward an observer standing at 5 o'clock. what should the angle of incidence be to achieve this? what should the angle of reflection be?
Which has greater force fly hitting windshield of rapidly moving car or the force of windshield hitting fly? Explain
When a fly collides with a moving car's windshield, the force exerted by both on each other is equal in magnitude due to Newton's Third Law of Motion. The differing outcomes (the fly typically being destroyed while the car remains largely unaffected) are a result of the vastly different masses and resulting accelerations, not a difference in the magnitude of force.
When a fly hits the windshield of a rapidly moving car, an interesting physics principle comes into play, known as Newton's Third Law of Motion. This law states that for every action, there is an equal and opposite reaction. Therefore, the force that the fly exerts on the windshield is equal in magnitude to the force that the windshield exerts on the fly during the collision. However, the outcomes are vastly different for the fly and the car due to their significant difference in mass. The car has a much larger mass and therefore experiences a negligible acceleration from the force, while the light-mass fly undergoes a large acceleration, often resulting in its death.
The Third Law of Motion can be counterintuitive because we observe the effects of the forces differently due to the difference in mass and resulting acceleration. But it’s crucial to understand that in terms of the forces experienced by both objects, they are identical. This is why the correct answer is that neither the car nor the fly experiences a greater force than the other in magnitude during the collision.
It is weigh-in time for the local under 85 kg rugby team. The bathroom scale used to assess eligibilty can be described by Hooke's law, which is depressed 0.65 cm for its maximum load of 115 kg. What is the spring's effective spring constant?
A player stands on the scale, and it depresses by 0.39cm. What is the mass of the player?,
The effective spring constant of the bathroom scale is approximately 174,738 N/m.
The mass of the player is approximately 69.51 kg.
To determine the spring constant of the bathroom scale, you can use Hooke's law, which relates the force applied to a spring (F) to its displacement (x) and the spring constant (k):
F = -k * x
In this case, we know that the scale depresses 0.65 cm (which is equivalent to 0.0065 meters) under a load of 115 kg. We can use this information to find the spring constant (k):
115 kg * 9.81 m/s² = k * 0.0065 m
Now, solve for k:
k = (115 kg * 9.81 m/s²) / 0.0065 m
k ≈ 174,738 N/m
Hence, the effective spring constant of the bathroom scale is approximately 174,738 N/m.
Now, to find the mass of the player who depresses the scale by 0.39 cm (which is equivalent to 0.0039 meters), you can use Hooke's law again:
F = -k * x
Where:
F is the force exerted by the player's weight (in Newtons)
k is the spring constant (we just found it to be 174,738 N/m)
x is the displacement of the spring (0.0039 meters)
Now, solve for F:
F = -174,738 N/m * 0.0039 m
F ≈ -681.882 N
Since weight is the force due to gravity (F = m * g), where "m" is the mass of the player and "g" is the acceleration due to gravity (approximately 9.81 m/s²), we can find the mass of the player:
m = F / g
m = (-681.882 N) / (9.81 m/s²)
m ≈ -69.51 kg
The negative sign indicates that the player's weight is acting in the opposite direction of the scale's displacement.
Hence, the mass of the player is approximately 69.51 kg.
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Describe the steps in which a power plant transforms the energy in fossil fuels to electrical energy.
Power plants burn fossil fuels to produce steam, which spins a turbine connected to a generator, converting thermal energy into electrical energy. The electricity is then transmitted and distributed to homes and businesses.
Power plants convert fossil fuels into electrical energy through the following steps:
1. Fuel Combustion: Fossil fuels (coal, natural gas, or oil) are burned in a boiler to produce heat, releasing chemical energy.
2. Heat Production: The heat converts water into high-pressure steam.
3. Steam Generation: The steam heats up and pressurizes.
4. Mechanical Energy: High-pressure steam spins a turbine, converting thermal energy into mechanical energy.
5. Electrical Generation: The turbine drives a generator, converting mechanical energy into electrical energy.
6. Transmission: Electricity is transmitted through power lines at high voltage.
7. Distribution: Substations reduce voltage for safe distribution to homes and businesses.
8. Waste Management: Steam is condensed back to water and reused, and emissions are controlled to minimize environmental impact.
This cycle efficiently converts fossil fuel energy into electrical power.
A 65 Kg roller-blade is accelerating at 5 m/s/s across the side walk. What force would be necessary for this acceleration to occur?
You drive in a straight line at 24.0 m/s for 8.0 miles, then at 30.0 m/s for another 8.0 miles. What is the average velocity?
Which two energy sources can help a star maintain its internal thermal pressure? which two energy sources can help a star maintain its internal thermal pressure? nuclear fission and gravitational contraction nuclear fusion and chemical reactions chemical reactions and gravitational contraction nuclear fusion and gravitational contraction nuclear fusion and nuclear fission?
Answer:
nuclear fission and gravitational contraction
Explanation:
Which two energy sources can help a star maintain its internal thermal pressure? which two energy sources can help a star maintain its internal thermal pressure? nuclear fission and gravitational contraction nuclear fusion and chemical reactions chemical reactions and gravitational contraction nuclear fusion and gravitational contraction nuclear fusion and nuclear fission?
What is Nuclear fission is when a heavy nucleus split to release energy . it splits into two lesser nuclei.
Gravitational contraction:
is when there is collapse of an object in space due to the influence of its own gravity. This two phenomenon makes it possible for a satr to maintain its thermal (heat )pressure.